Music
The song, which is also the title of Perry's sophomore album, has been added to 87 radio stations over the course of a week - the highest number of adds for a song ever.
The track was released on Monday to US iTunes and has soared to number three, two places ahead of her last single 'California Gurls'.
Her debut album One Of The Boys is also on course to return to the US album chart after rising to number five on iTunes.
Last month, Katy Perry broke the US airplay record after 'California Gurls' received 11,816 plays in a week - an everage of 90 plays per radio station.
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